Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under Omnibus Incentive Plan						1,000,000
Stock options vesting period, years		3 years
Stock options exercise price		$ 20.00
Stock options fair value		$ 7.40
Expected life of options, years		6 years
Risk-free interest rate		1.98%
Expected dividend yield		3.60%
Expected forfeiture rate		8.00%
Expected volatility rate		53.02%
Stock-based compensation expense for non-qualified stock options to selected employees		$ 1,200
Requisite service period, years		3 years
Fair market value of fully vested shares as of the grant date	25,000			25,000
Shares of common stock issued to non-employee directors		12,500
Stock-based compensation expense	305,000		341,000	903,000	845,000
Income tax benefit from stock-based compensation expense	$ 107,000		$ 120,000	$ 316,000	$ 296,000
Non-Qualified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options life, years		10 years
Stock options granted to selected employees		176,000